noun

• A surname from Scottish Gaelic.
• A census-designated place in Raleigh County, West Virginia, United States.
• A surname.
• A place in Australia:
• A suburb of Canberra, Australian Capital Territory, named after John Macarthur (wool pioneer).
• A region of Sydney, in the City of Campbelltown, Camden council area and Wollondilly Shire, New South Wales, named after John Macarthur and Elizabeth Macarthur.
• A town in the Shire of Moyne, south-west Victoria.